CN104896208A - Novel hydropower station giant pressure pipeline - Google Patents

Abstract

The invention provides a novel hydropower station giant pressure pipeline comprising a reactive powder concrete pipe and an external winding prestressed wire externally wound around the reactive powder concrete pipe. One end of the reactive powder concrete pipe is provided with mortises and the other end is provided with tenons. Connected tenon-mortise structures are provided with copper water stops. Outer wrapped concrete is poured on the outer side of the reactive powder concrete pipe and is internally provided with a rebar net which is formed by binding and tying annular rebars and longitudinal rebars and is externally wound around the reactive powder concrete pipe. The reactive powder concrete pipe replaces steel to be used as the pipe body material, so that the problem that the domestic yield of high-strength low alloy hardened and tempered steel cannot meet the demand of giant pressure steel pipes is solved; the prestressed reactive powder concrete pipe replaces a steel pipe, so that the technical requirements in the pressure pipeline production process is reduced and the energy consumption and the cost are reduced; the critical instability stress is improved and the problem of instability, buckling and damage of pressure steel pipes caused by external pressure is solved; the durability of outer wrapped concrete is guaranteed and the problem of corrosion of steel is radically solved.

Description

The huge pressure piping in new type water power station

Technical field

The present invention relates to Diversion system of hydropower station equipment, be specially the huge pressure piping in a kind of new type water power station.

Background technique

Newly-built along with large-scale routine and pumped storage power station, steel lined compressive pipe of reinforced concrete is because of its good bearing capacity and comparatively economic advantage, more and more be used in Diversion system of hydropower station, but steel lined compressive pipe of reinforced concrete steel used are High-Strength Low-Alloy Hardened And Tempered Steel, this steel manufacturing requirements is high, energy consumption is large, and price is high, and output in domestic can not meet the needs of giant pressure steel pipe completely; The simultaneously welding of thick walled steel tube, manufacture and mounting technique difficulty are large, production is wasted time and energy, and there is complicated welding heat residual stress field in weld joint, causes the rupture failure of weld seam and steel pipe sometimes, this has buried hidden danger to the safety of steel lined compressive pipe of reinforced concrete battalion, and risk is larger; Moreover pipeline emptying, seepage pressure, the stability problem that the external pressures such as grouting pressure cause, also hinders the development of steel lined compressive pipe of reinforced concrete always.In stiffener penstock construction, the empty nest that stiffening rib place exists concrete vibrating leakiness and causes, also exists certain shrinkage cracks between tube wall and concrete, and external wrapping concrete ftractures, and the problem of the concrete durability caused and unstability buckling failure.These technical barriers, along with the development in water power plant, do not obtain the solution of matter.

Therefore, in the face of the demand of huge pressure piping new structure type, overcome the deficiency that tradition has just changed the structure of traditional huge steel lined compressive pipe of reinforced concrete, innovate the structural design of huge pressure piping, promote the development of hydropower and other similar engineering, very urgent.

Summary of the invention

In order to overcome above-mentioned deficiency of the prior art, the invention provides a kind of technical requirements reduced in pressure piping production process, reducing energy consumption and cost simultaneously; Processing, makes, and installation process does not exist the technique of solder joint and welding stiffening ring, and pipeline is complete, reduces the huge pressure piping in new type water power station of the risk that pressure piping runs.

The object of the present invention is achieved like this:

The huge pressure piping in new type water power station, comprises 1, is wrapped in the outer winding reinforcement wire 4 outside RPC pipe 1; One end of described RPC pipe 1 is provided with mortise, and the other end is provided with mortise; The tenon structure place connected is provided with Copper water stop 3; Build external wrapping concrete 2 outside RPC pipe 1, be provided with in external wrapping concrete 2 and be wrapped in the outer reinforcing mesh become with longitudinal steel bar 5 colligation by circumferential reinforcement 6 of RPC pipe 1;

The construction process of the described huge pressure piping in new type water power station, its concrete steps are:

The first step: in factory, the mould of supporting body, mould generally adopts large-scale combined steel cylinder mould, and diameter is determined as required; Adopt centrifugal molding process to make RPC pipe 1, in process, note form and the quality control of two-port;

Second step: the body after shaping is put into steam press maintenance room and carried out maintenance, put after reaching design strength and be wound around reinforcement wire 4 to large-scale twining on a machine, steel wire diameter commonly uses 5 ~ 9mm diameter;

3rd, settle the connection pipe body at RPC pipe 1 two ends, connection pipe body adopts tenon connection, and first in termination, epoxy resin is coated at concavo-convex position, utilizes hanging device connection pipe body, must require that position, gap processes perfect; After treating epoxy resin initial set on connection part pad rubber washer and copper cranse, utilize pretensioner to carry out pretension to copper cranse;

4th step: carry out longitudinal steel bar 5, the layout of circumferential reinforcement 6 and building of external wrapping concrete 2 at body and reinforcement wire periphery;

5th step: maintenance work is carried out to reinforced concrete enveloped 2;

6th step: the crack and the airtight performance that finally check body, realize re-set target of the present invention.

positive beneficial effect:(1) the present invention adopts RPC to replace steel as body material, alleviates the contradiction that domestic High-Strength Low-Alloy Hardened And Tempered Steel output can not meet the demand of giant pressure steel pipe.(2) the prestressing force RPC pipe that the present invention adopts substitutes steel pipe, reduces the technical requirements in pressure piping production process, reduces energy consumption and cost simultaneously.

(3) processing of prestressing force RPC pipe, makes, and installation process does not exist the technique of solder joint and welding stiffening ring, and pipeline is complete, does not have defect, reduces the risk that pressure piping runs.(4) effectively prevent the factor of pressure piping external pressure unstability, improve critical jitter stress, solve the problem of penstock external pressure unstability buckling failure.(5) ensure that the durability of external wrapping concrete, eradicate the problem of Corrosion Of Steel.

Accompanying drawing explanation

Fig. 1 is novel pressure cross-section of pipeline schematic diagram of the present invention;

Fig. 2 is novel pressure pipeline longitudinal section of the present invention and port thin portion schematic diagram;

Fig. 3 is novel pressure pipe connection portion position of the present invention Copper water stop schematic diagram;

Fig. 4 twines reinforcement wire schematic diagram outside novel pressure pipeline of the present invention;

Fig. 5 is external wrapping concrete steel bar arrangement cross sectional representation of the present invention;

Fig. 6 is external wrapping concrete steel bar arrangement longitudinal section of the present invention schematic diagram;

In figure be: RPC pipe 1, external wrapping concrete 2, Copper water stop 3, outer winding reinforcement wire 4, longitudinal steel bar 5, circumferential reinforcement 6.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described further:

As shown in Figure 1 and Figure 2, the huge pressure piping in new type water power station, comprises RPC pipe 1, is wrapped in the outer winding reinforcement wire 4 outside RPC pipe 1; One end of described RPC pipe 1 is provided with mortise, and the other end is provided with mortise; The tenon structure place connected is provided with Copper water stop 3; Build external wrapping concrete 2 outside RPC pipe 1, be provided with in external wrapping concrete 2 and be wrapped in the outer reinforcing mesh become with longitudinal steel bar 5 colligation by circumferential reinforcement 6 of RPC pipe 1;

The construction process of the described huge pressure piping in new type water power station, its concrete steps are:

The first step: first in factory, the mould of supporting body, mould generally adopts large-scale combined steel cylinder mould, and diameter is determined as required, generally at about 10m.Adopt centrifugal molding process to make RPC pipe 1, in process, note form and the quality control of two-port;

Second: the body after shaping is put into steam press maintenance room and carried out maintenance, put after reaching design strength to large-scale twining on a machine and be wound around reinforcement wire 4, steel wire diameter commonly uses 5 ~ 9mm diameter, and concrete specification, with reference to GB5223-2002 reinforcement wire selection standard, twines a model shown in Figure 4;

3rd step: settle connection pipe body, body adopts tenon connection, and as shown in Figure 2, first in termination, epoxy resin is coated at concavo-convex position, utilizes hanging device connection pipe body, must require that position, gap processes perfect.After treating epoxy resin initial set on connection part pad rubber washer and copper cranse, utilize pretensioner to carry out pretension to copper cranse, as shown in Figure 3;

4th step: carry out longitudinal steel bar 5, the layout of circumferential reinforcement 6 and building of external wrapping concrete 2 at body and reinforcement wire periphery as shown in Figure 5, Figure 6;

5th step:, maintenance work is carried out to reinforced concrete enveloped 2;

6th step: the crack and the airtight performance that finally check body, realize re-set target of the present invention.

working mechanism

(1) in the outside of RPC pipe, be wound around reinforcement wire, both improve the stress phase of RPC pipe under inside water pressure effect, also side limit had been carried out to RPC, improve the RPC strength of materials and ductility.

(2) due to the thickness of RPC is generally steel lined compressive pipe of reinforced concrete light plate about 15 times, the increase of the thickness of RPC pipe, greatly improve the critical force of pipeline external pressure unstability, avoid pipeline generation unstability buckling failure.

(3) because the ratio of RPC and normal concrete Young's modulus is much smaller than the ratio of steel pipe with normal concrete Young's modulus, there is not the problem of CBR between inner layer steel pipe and external wrapping concrete, therefore the elastic insert can cancelled between steel pipe and normal concrete, make RPC and the direct sharing lood of normal concrete.

(4) there is not welding due to RPC pipe of the present invention and add the techniques such as stiffening ring, ensure that the structural integrity of pipeline, there is not empty nest, the defects such as drying shrinkage gap, ensure that the durability of external wrapping concrete.

(5) two sections of RPC pipes connect by the method for tenon connection, ensure that the continuity of joint, end pipeline.

(6) in the joint of two sections of RPC pipes, add Copper water stop, Seepage can not occur.

Above case study on implementation is only for illustration of the preferred embodiment of the present invention; but the present invention is not limited to above-mentioned mode of execution; in the ken that described exercising ordinary skill possesses; the any amendment done within the spirit and principles in the present invention, equivalent to substitute and improvement etc., the protection domain of the application all should be considered as.

Claims (2)

1. the huge pressure piping in new type water power station, is characterized in that: comprise RPC pipe (1), is wrapped in RPC pipe (1) outer winding reinforcement wire (4) outward; One end of described RPC pipe (1) is provided with mortise, and the other end is provided with mortise; The tenon structure place connected is provided with Copper water stop (3); Build external wrapping concrete (2) outside RPC pipe (1), in external wrapping concrete (2), be provided with the reinforcing mesh being wrapped in RPC pipe (1) and being become with longitudinal steel bar (5) colligation by circumferential reinforcement (6) outward.

2. the construction process of the described huge pressure piping in new type water power station as claimed in claim 1, its concrete steps are:

The first step: in factory, the mould of supporting body, mould generally adopts large-scale combined steel cylinder mould, and diameter is determined as required; Adopt centrifugal molding process to make RPC pipe (1), in process, note form and the quality control of two-port;

Second step: the body after shaping is put into steam press maintenance room and carried out maintenance, put after reaching design strength and be wound around reinforcement wire (4) to large-scale twining on a machine, steel wire diameter commonly uses 5 ~ 9mm diameter;

3rd, settle the connection pipe body at RPC pipe (1) two ends, connection pipe body adopts tenon connection, and first in termination, epoxy resin is coated at concavo-convex position, utilizes hanging device connection pipe body, must require that position, gap processes perfect; After treating epoxy resin initial set on connection part pad rubber washer and copper cranse, utilize pretensioner to carry out pretension to copper cranse;

4th step: carry out longitudinal steel bar (5), the layout of circumferential reinforcement (6) and building of external wrapping concrete (2) at body and reinforcement wire periphery;

5th step: maintenance work is carried out to reinforced concrete enveloped (2);

6th step: the crack and the airtight performance that finally check body, realize re-set target of the present invention.